osd: EC Optimizations: Relax reset_complete_to for partial writes

osd: EC Optimizations: Relax reset_complete_to for partial writes

EC Optimized pools can have shards missing log entries because
of partial writes. This means it is possible to have a missing
entry with a newer version than the log. Relax an assert in
reset_complete_to to avoid this.

reset_complete_to also resets last_complete to 0 when the
oldest missing object is before the first log entry. This
is to aggressive for partial writes and needs to be relaxed.

Signed-off-by: Bill Scales <bill_scales@uk.ibm.com>